Wavetek 3ST Manual de usuario descargar pdf (Pagina 4)

CSO and CTB Display

Data Analysis and Management

With StealthWare

Any stored Stealth measurement

information can be uploaded to a

PC using StealthWare, a

Windows™ based data

management package. Stored

sweep, scan, or spectrum screens

can be viewed on the PC and

analyzed with marker movement

and readout information just as on

the actual unit. StealthWare allows

the operator to build channel plans

and edit site locations which can

then be downloaded to multiple

Stealth instruments. Additionally,

channel plans can be uploaded to

the PC, modified in StealthWare,

and then downloaded back to the

Stealth instrument.

Reverse Sweep Option

A Stealth Sweep System

configured with a Reverse Sweep

(3SRV) option allows simple,

practical testing of the frequency

response of the reverse path,

regardless of the frequency pass-

band (5 to 1,000 MHz range). No

special pilot modules are required,

as the 3ST transmitter and the

3SR receiver have frequency agile

telemetry and can be configured to

communicate on both the forward

and reverse paths.

Forward (outbound) and reverse

(inbound) path alignment can be

done simultaneously by one

person. The operator simply

indicates which screen to be

viewed, one being the response

from the headend to the test point,

the other being the response from

the test point to the headend.

There is a contention mechanism

in place that permits multiple

users to perform forward and

reverse alignment.

Because the reverse sweep

consists of only inserted sweep

signals, and the bandwidth is

typically relatively narrow (5 to 30

MHz), the sweep update is

remarkably quick.

Reverse Noise

There are two key requirements

to ensuring the proper operation of

the reverse path. One is that the

amplifiers be properly aligned to

ensure that the digital signals are

not clipped or compressed. The

other is to maintain a proper

carrier-to-noise and carrier-to-

ingress ratio.

The Reverse Noise feature of

the 3SRV option enables a quick

swept noise test at the reverse

sweep point frequencies. The

operator simply presses the

“Noise” soft key while sweeping

reverse, and the display changes to

a noise response indicating the

noise level at the reverse sweep

insertion frequencies. This

provides for simple, comprehensive

testing of both amplifier alignment

and C/N in the headend based on

the signal injected at a specific test

point.

Portable Transmitter Option

The Model 3SR with a 3SRT

option provides a flexible, portable

solution for testing particular

segments of a network. It is also a

convenient problem solver for the

contractor who may not have ready

access to the headend, or who

wants to be ready for anything

unexpected.

This hand-held instrument not

only receives sweep and performs

the reverse sweep, but it can be

configured to operate exactly like

the 19" rack-mounted Model 3ST

Transmitter. Applications for this

include situations where it might

be desirable to test a specific

portion of the plant, while

remaining unconnected to the

headend. This might occur in new

or rebuild cases in which physical

or bureaucratic barriers impede

connection to the headend. The

3SRT is also useful in construction

situations where it is desirable to

sweep cable prior to the

installation of active components.

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